2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
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8 * modification, are permitted provided that the following conditions
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15 * the documentation and/or other materials provided with the
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
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37 * can do whatever you want with this stuff. If we meet some day, and you think
38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
77 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
78 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
79 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
80 * $DragonFly: src/sys/kern/subr_disk.c,v 1.40 2008/06/05 18:06:32 swildner Exp $
83 #include <sys/param.h>
84 #include <sys/systm.h>
85 #include <sys/kernel.h>
87 #include <sys/sysctl.h>
90 #include <sys/disklabel.h>
91 #include <sys/disklabel32.h>
92 #include <sys/disklabel64.h>
93 #include <sys/diskslice.h>
94 #include <sys/diskmbr.h>
96 #include <sys/kerneldump.h>
97 #include <sys/malloc.h>
98 #include <sys/sysctl.h>
99 #include <machine/md_var.h>
100 #include <sys/ctype.h>
101 #include <sys/syslog.h>
102 #include <sys/device.h>
103 #include <sys/msgport.h>
104 #include <sys/msgport2.h>
105 #include <sys/buf2.h>
106 #include <sys/devfs.h>
107 #include <sys/thread.h>
108 #include <sys/thread2.h>
110 #include <sys/queue.h>
111 #include <sys/lock.h>
113 static MALLOC_DEFINE(M_DISK, "disk", "disk data");
114 static int disk_debug_enable = 0;
116 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
117 static void disk_msg_core(void *);
118 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe);
119 static void disk_probe(struct disk *dp, int reprobe);
120 static void _setdiskinfo(struct disk *disk, struct disk_info *info);
121 static void bioqwritereorder(struct bio_queue_head *bioq);
122 static void disk_cleanserial(char *serno);
124 static d_open_t diskopen;
125 static d_close_t diskclose;
126 static d_ioctl_t diskioctl;
127 static d_strategy_t diskstrategy;
128 static d_psize_t diskpsize;
129 static d_clone_t diskclone;
130 static d_dump_t diskdump;
132 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
133 static struct lwkt_token disklist_token;
135 static struct dev_ops disk_ops = {
136 { "disk", 0, D_DISK },
138 .d_close = diskclose,
140 .d_write = physwrite,
141 .d_ioctl = diskioctl,
142 .d_strategy = diskstrategy,
144 .d_psize = diskpsize,
148 static struct objcache *disk_msg_cache;
150 struct objcache_malloc_args disk_msg_malloc_args = {
151 sizeof(struct disk_msg), M_DISK };
153 static struct lwkt_port disk_dispose_port;
154 static struct lwkt_port disk_msg_port;
157 disk_debug(int level, char *fmt, ...)
162 if (level <= disk_debug_enable)
170 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
172 struct disk_info *info = &dp->d_info;
173 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
175 struct partinfo part;
182 "disk_probe_slice (begin): %s (%s)\n",
183 dev->si_name, dp->d_cdev->si_name);
185 sno = slice ? slice - 1 : 0;
187 ops = &disklabel32_ops;
188 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
189 if (msg && !strcmp(msg, "no disk label")) {
190 ops = &disklabel64_ops;
191 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
194 if (slice != WHOLE_DISK_SLICE)
195 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
200 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
201 ops->op_loadpartinfo(sp->ds_label, i, &part);
204 (ndev = devfs_find_device_by_name("%s%c",
205 dev->si_name, 'a' + i))
208 * Device already exists and
211 ndev->si_flags |= SI_REPROBE_TEST;
213 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
214 dkmakeminor(dkunit(dp->d_cdev),
216 UID_ROOT, GID_OPERATOR, 0640,
217 "%s%c", dev->si_name, 'a'+ i);
219 if (dp->d_info.d_serialno) {
222 dp->d_info.d_serialno,
225 ndev->si_flags |= SI_REPROBE_TEST;
229 } else if (info->d_dsflags & DSO_COMPATLABEL) {
231 if (sp->ds_size >= 0x100000000ULL)
232 ops = &disklabel64_ops;
234 ops = &disklabel32_ops;
235 sp->ds_label = ops->op_clone_label(info, sp);
237 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */
238 sp->ds_type == DOSPTYP_NETBSD ||
239 sp->ds_type == DOSPTYP_OPENBSD) {
240 log(LOG_WARNING, "%s: cannot find label (%s)\n",
246 sp->ds_wlabel = FALSE;
249 return (msg ? EINVAL : 0);
254 disk_probe(struct disk *dp, int reprobe)
256 struct disk_info *info = &dp->d_info;
257 cdev_t dev = dp->d_cdev;
260 struct diskslice *sp;
262 KKASSERT (info->d_media_blksize != 0);
264 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
266 "disk_probe (begin): %s\n",
267 dp->d_cdev->si_name);
269 error = mbrinit(dev, info, &(dp->d_slice));
273 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
275 * Ignore the whole-disk slice, it has already been created.
277 if (i == WHOLE_DISK_SLICE)
279 sp = &dp->d_slice->dss_slices[i];
282 * Handle s0. s0 is a compatibility slice if there are no
283 * other slices and it has not otherwise been set up, else
286 if (i == COMPATIBILITY_SLICE) {
288 if (sp->ds_type == 0 &&
289 dp->d_slice->dss_nslices == BASE_SLICE) {
290 sp->ds_size = info->d_media_blocks;
299 * Ignore 0-length slices
301 if (sp->ds_size == 0)
305 (ndev = devfs_find_device_by_name("%ss%d",
306 dev->si_name, sno))) {
308 * Device already exists and is still valid
310 ndev->si_flags |= SI_REPROBE_TEST;
313 * Else create new device
315 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
316 dkmakewholeslice(dkunit(dev), i),
317 UID_ROOT, GID_OPERATOR, 0640,
318 "%ss%d", dev->si_name, sno);
319 if (dp->d_info.d_serialno) {
320 make_dev_alias(ndev, "serno/%s.s%d",
321 dp->d_info.d_serialno, sno);
324 ndev->si_flags |= SI_REPROBE_TEST;
329 * Probe appropriate slices for a disklabel
331 * XXX slice type 1 used by our gpt probe code.
332 * XXX slice type 0 used by mbr compat slice.
334 if (sp->ds_type == DOSPTYP_386BSD ||
335 sp->ds_type == DOSPTYP_NETBSD ||
336 sp->ds_type == DOSPTYP_OPENBSD ||
339 if (dp->d_slice->dss_first_bsd_slice == 0)
340 dp->d_slice->dss_first_bsd_slice = i;
341 disk_probe_slice(dp, ndev, i, reprobe);
345 "disk_probe (end): %s\n",
346 dp->d_cdev->si_name);
351 disk_msg_core(void *arg)
354 struct diskslice *sp;
359 lwkt_initport_thread(&disk_msg_port, curthread);
364 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
366 switch (msg->hdr.u.ms_result) {
367 case DISK_DISK_PROBE:
368 dp = (struct disk *)msg->load;
370 "DISK_DISK_PROBE: %s\n",
371 dp->d_cdev->si_name);
374 case DISK_DISK_DESTROY:
375 dp = (struct disk *)msg->load;
377 "DISK_DISK_DESTROY: %s\n",
378 dp->d_cdev->si_name);
379 devfs_destroy_subnames(dp->d_cdev->si_name);
380 devfs_destroy_dev(dp->d_cdev);
381 lwkt_gettoken(&ilock, &disklist_token);
382 LIST_REMOVE(dp, d_list);
383 lwkt_reltoken(&ilock);
384 if (dp->d_info.d_serialno) {
385 kfree(dp->d_info.d_serialno, M_TEMP);
386 dp->d_info.d_serialno = NULL;
390 dp = (struct disk *)msg->load;
392 "DISK_DISK_UNPROBE: %s\n",
393 dp->d_cdev->si_name);
394 devfs_destroy_subnames(dp->d_cdev->si_name);
396 case DISK_SLICE_REPROBE:
397 dp = (struct disk *)msg->load;
398 sp = (struct diskslice *)msg->load2;
399 devfs_clr_subnames_flag(sp->ds_dev->si_name,
402 "DISK_SLICE_REPROBE: %s\n",
403 sp->ds_dev->si_name);
404 disk_probe_slice(dp, sp->ds_dev,
405 dkslice(sp->ds_dev), 1);
406 devfs_destroy_subnames_without_flag(
407 sp->ds_dev->si_name, SI_REPROBE_TEST);
409 case DISK_DISK_REPROBE:
410 dp = (struct disk *)msg->load;
411 devfs_clr_subnames_flag(dp->d_cdev->si_name, SI_REPROBE_TEST);
413 "DISK_DISK_REPROBE: %s\n",
414 dp->d_cdev->si_name);
416 devfs_destroy_subnames_without_flag(
417 dp->d_cdev->si_name, SI_REPROBE_TEST);
420 disk_debug(1, "DISK_SYNC\n");
423 devfs_debug(DEVFS_DEBUG_WARNING,
424 "disk_msg_core: unknown message "
425 "received at core\n");
428 lwkt_replymsg((lwkt_msg_t)msg, 0);
435 * Acts as a message drain. Any message that is replied to here gets
436 * destroyed and the memory freed.
439 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
441 objcache_put(disk_msg_cache, msg);
446 disk_msg_send(uint32_t cmd, void *load, void *load2)
449 lwkt_port_t port = &disk_msg_port;
451 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
453 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
455 disk_msg->hdr.u.ms_result = cmd;
456 disk_msg->load = load;
457 disk_msg->load2 = load2;
459 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
463 disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
465 struct lwkt_port rep_port;
466 disk_msg_t disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
467 disk_msg_t msg_incoming;
468 lwkt_port_t port = &disk_msg_port;
470 lwkt_initport_thread(&rep_port, curthread);
471 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
473 disk_msg->hdr.u.ms_result = cmd;
474 disk_msg->load = load;
475 disk_msg->load2 = load2;
478 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
479 msg_incoming = lwkt_waitport(&rep_port, 0);
483 * Create a raw device for the dev_ops template (which is returned). Also
484 * create a slice and unit managed disk and overload the user visible
485 * device space with it.
487 * NOTE: The returned raw device is NOT a slice and unit managed device.
488 * It is an actual raw device representing the raw disk as specified by
489 * the passed dev_ops. The disk layer not only returns such a raw device,
490 * it also uses it internally when passing (modified) commands through.
493 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
499 "disk_create (begin): %s%d\n",
500 raw_ops->head.name, unit);
502 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
503 UID_ROOT, GID_OPERATOR, 0640,
504 "%s%d", raw_ops->head.name, unit);
506 bzero(dp, sizeof(*dp));
508 dp->d_rawdev = rawdev;
509 dp->d_raw_ops = raw_ops;
510 dp->d_dev_ops = &disk_ops;
511 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
512 dkmakewholedisk(unit),
513 UID_ROOT, GID_OPERATOR, 0640,
514 "%s%d", raw_ops->head.name, unit);
516 dp->d_cdev->si_disk = dp;
518 lwkt_gettoken(&ilock, &disklist_token);
519 LIST_INSERT_HEAD(&disklist, dp, d_list);
520 lwkt_reltoken(&ilock);
523 "disk_create (end): %s%d\n",
524 raw_ops->head.name, unit);
526 return (dp->d_rawdev);
531 _setdiskinfo(struct disk *disk, struct disk_info *info)
535 oldserialno = disk->d_info.d_serialno;
536 bcopy(info, &disk->d_info, sizeof(disk->d_info));
537 info = &disk->d_info;
540 "_setdiskinfo: %s\n",
541 disk->d_cdev->si_name);
544 * The serial number is duplicated so the caller can throw
547 if (info->d_serialno && info->d_serialno[0]) {
548 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
549 disk_cleanserial(info->d_serialno);
551 make_dev_alias(disk->d_cdev, "serno/%s",
555 info->d_serialno = NULL;
558 kfree(oldserialno, M_TEMP);
561 * The caller may set d_media_size or d_media_blocks and we
562 * calculate the other.
564 KKASSERT(info->d_media_size == 0 || info->d_media_blksize == 0);
565 if (info->d_media_size == 0 && info->d_media_blocks) {
566 info->d_media_size = (u_int64_t)info->d_media_blocks *
567 info->d_media_blksize;
568 } else if (info->d_media_size && info->d_media_blocks == 0 &&
569 info->d_media_blksize) {
570 info->d_media_blocks = info->d_media_size /
571 info->d_media_blksize;
575 * The si_* fields for rawdev are not set until after the
576 * disk_create() call, so someone using the cooked version
577 * of the raw device (i.e. da0s0) will not get the right
578 * si_iosize_max unless we fix it up here.
580 if (disk->d_cdev && disk->d_rawdev &&
581 disk->d_cdev->si_iosize_max == 0) {
582 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
583 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
584 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
589 * Disk drivers must call this routine when media parameters are available
593 disk_setdiskinfo(struct disk *disk, struct disk_info *info)
595 _setdiskinfo(disk, info);
596 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
598 "disk_setdiskinfo: sent probe for %s\n",
599 disk->d_cdev->si_name);
603 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
605 _setdiskinfo(disk, info);
606 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
608 "disk_setdiskinfo_sync: sent probe for %s\n",
609 disk->d_cdev->si_name);
613 * This routine is called when an adapter detaches. The higher level
614 * managed disk device is destroyed while the lower level raw device is
618 disk_destroy(struct disk *disk)
620 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
625 disk_dumpcheck(cdev_t dev, u_int64_t *size, u_int64_t *blkno, u_int32_t *secsize)
627 struct partinfo pinfo;
630 bzero(&pinfo, sizeof(pinfo));
631 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0,
632 proc0.p_ucred, NULL);
636 if (pinfo.media_blksize == 0)
639 if (blkno) /* XXX: make sure this reserved stuff is right */
640 *blkno = pinfo.reserved_blocks +
641 pinfo.media_offset / pinfo.media_blksize;
643 *secsize = pinfo.media_blksize;
645 *size = (pinfo.media_blocks - pinfo.reserved_blocks);
651 disk_dumpconf(cdev_t dev, u_int onoff)
653 struct dumperinfo di;
654 u_int64_t size, blkno;
659 return set_dumper(NULL);
661 error = disk_dumpcheck(dev, &size, &blkno, &secsize);
666 bzero(&di, sizeof(struct dumperinfo));
667 di.dumper = diskdump;
669 di.blocksize = secsize;
670 di.mediaoffset = blkno * DEV_BSIZE;
671 di.mediasize = size * DEV_BSIZE;
673 return set_dumper(&di);
677 disk_unprobe(struct disk *disk)
682 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
686 disk_invalidate (struct disk *disk)
689 dsgone(&disk->d_slice);
693 disk_enumerate(struct disk *disk)
698 lwkt_gettoken(&ilock, &disklist_token);
700 dp = (LIST_FIRST(&disklist));
702 dp = (LIST_NEXT(disk, d_list));
703 lwkt_reltoken(&ilock);
710 sysctl_disks(SYSCTL_HANDLER_ARGS)
718 while ((disk = disk_enumerate(disk))) {
720 error = SYSCTL_OUT(req, " ", 1);
726 error = SYSCTL_OUT(req, disk->d_rawdev->si_name,
727 strlen(disk->d_rawdev->si_name));
731 error = SYSCTL_OUT(req, "", 1);
735 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
736 sysctl_disks, "A", "names of available disks");
739 * Open a disk device or partition.
743 diskopen(struct dev_open_args *ap)
745 cdev_t dev = ap->a_head.a_dev;
750 * dp can't be NULL here XXX.
752 * d_slice will be NULL if setdiskinfo() has not been called yet.
753 * setdiskinfo() is typically called whether the disk is present
754 * or not (e.g. CD), but the base disk device is created first
755 * and there may be a race.
758 if (dp == NULL || dp->d_slice == NULL)
763 * Deal with open races
765 while (dp->d_flags & DISKFLAG_LOCK) {
766 dp->d_flags |= DISKFLAG_WANTED;
767 error = tsleep(dp, PCATCH, "diskopen", hz);
771 dp->d_flags |= DISKFLAG_LOCK;
774 * Open the underlying raw device.
776 if (!dsisopen(dp->d_slice)) {
778 if (!pdev->si_iosize_max)
779 pdev->si_iosize_max = dev->si_iosize_max;
781 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
782 ap->a_devtype, ap->a_cred);
786 * Inherit properties from the underlying device now that it is
794 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
795 &dp->d_slice, &dp->d_info);
796 if (!dsisopen(dp->d_slice)) {
797 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype);
800 dp->d_flags &= ~DISKFLAG_LOCK;
801 if (dp->d_flags & DISKFLAG_WANTED) {
802 dp->d_flags &= ~DISKFLAG_WANTED;
810 * Close a disk device or partition
814 diskclose(struct dev_close_args *ap)
816 cdev_t dev = ap->a_head.a_dev;
823 dsclose(dev, ap->a_devtype, dp->d_slice);
824 if (!dsisopen(dp->d_slice)) {
825 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype);
831 * First execute the ioctl on the disk device, and if it isn't supported
832 * try running it on the backing device.
836 diskioctl(struct dev_ioctl_args *ap)
838 cdev_t dev = ap->a_head.a_dev;
847 devfs_debug(DEVFS_DEBUG_DEBUG,
848 "diskioctl: cmd is: %x (name: %s)\n",
849 ap->a_cmd, dev->si_name);
850 devfs_debug(DEVFS_DEBUG_DEBUG,
851 "diskioctl: &dp->d_slice is: %x, %x\n",
852 &dp->d_slice, dp->d_slice);
854 if (ap->a_cmd == DIOCGKERNELDUMP) {
855 u = *(u_int *)ap->a_data;
856 return disk_dumpconf(dev, u);
859 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
860 &dp->d_slice, &dp->d_info);
862 if (error == ENOIOCTL) {
863 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
864 ap->a_fflag, ap->a_cred, NULL);
870 * Execute strategy routine
874 diskstrategy(struct dev_strategy_args *ap)
876 cdev_t dev = ap->a_head.a_dev;
877 struct bio *bio = ap->a_bio;
884 bio->bio_buf->b_error = ENXIO;
885 bio->bio_buf->b_flags |= B_ERROR;
889 KKASSERT(dev->si_disk == dp);
892 * The dscheck() function will also transform the slice relative
893 * block number i.e. bio->bio_offset into a block number that can be
894 * passed directly to the underlying raw device. If dscheck()
895 * returns NULL it will have handled the bio for us (e.g. EOF
896 * or error due to being beyond the device size).
898 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
899 dev_dstrategy(dp->d_rawdev, nbio);
907 * Return the partition size in ?blocks?
911 diskpsize(struct dev_psize_args *ap)
913 cdev_t dev = ap->a_head.a_dev;
919 ap->a_result = dssize(dev, &dp->d_slice);
924 * When new device entries are instantiated, make sure they inherit our
925 * si_disk structure and block and iosize limits from the raw device.
927 * This routine is always called synchronously in the context of the
930 * XXX The various io and block size constraints are not always initialized
931 * properly by devices.
935 diskclone(struct dev_clone_args *ap)
937 cdev_t dev = ap->a_head.a_dev;
941 KKASSERT(dp != NULL);
943 dev->si_iosize_max = dp->d_rawdev->si_iosize_max;
944 dev->si_bsize_phys = dp->d_rawdev->si_bsize_phys;
945 dev->si_bsize_best = dp->d_rawdev->si_bsize_best;
950 diskdump(struct dev_dump_args *ap)
952 cdev_t dev = ap->a_head.a_dev;
953 struct disk *dp = dev->si_disk;
954 u_int64_t size, offset;
957 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize);
958 /* XXX: this should probably go in disk_dumpcheck somehow */
959 if (ap->a_length != 0) {
961 offset = ap->a_blkno * DEV_BSIZE;
962 if ((ap->a_offset < offset) ||
963 (ap->a_offset + ap->a_length - offset > size)) {
964 kprintf("Attempt to write outside dump device boundaries.\n");
970 ap->a_head.a_dev = dp->d_rawdev;
971 error = dev_doperate(&ap->a_head);
978 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
979 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
981 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
982 0, sizeof(struct disk), "sizeof(struct disk)");
985 * Reorder interval for burst write allowance and minor write
988 * We always want to trickle some writes in to make use of the
989 * disk's zone cache. Bursting occurs on a longer interval and only
990 * runningbufspace is well over the hirunningspace limit.
992 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */
993 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval,
994 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, "");
995 int bioq_reorder_minor_interval = 5;
996 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval,
997 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, "");
999 int bioq_reorder_burst_bytes = 3000000;
1000 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes,
1001 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, "");
1002 int bioq_reorder_minor_bytes = 262144;
1003 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes,
1004 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, "");
1008 * Order I/Os. Generally speaking this code is designed to make better
1009 * use of drive zone caches. A drive zone cache can typically track linear
1010 * reads or writes for around 16 zones simultaniously.
1012 * Read prioritization issues: It is possible for hundreds of megabytes worth
1013 * of writes to be queued asynchronously. This creates a huge bottleneck
1014 * for reads which reduce read bandwidth to a trickle.
1016 * To solve this problem we generally reorder reads before writes.
1018 * However, a large number of random reads can also starve writes and
1019 * make poor use of the drive zone cache so we allow writes to trickle
1023 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
1026 * The BIO wants to be ordered. Adding to the tail also
1027 * causes transition to be set to NULL, forcing the ordering
1028 * of all prior I/O's.
1030 if (bio->bio_buf->b_flags & B_ORDERED) {
1031 bioq_insert_tail(bioq, bio);
1035 switch(bio->bio_buf->b_cmd) {
1037 if (bioq->transition) {
1039 * Insert before the first write. Bleedover writes
1040 * based on reorder intervals to prevent starvation.
1042 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act);
1044 if (bioq->reorder % bioq_reorder_minor_interval == 0) {
1045 bioqwritereorder(bioq);
1046 if (bioq->reorder >=
1047 bioq_reorder_burst_interval) {
1053 * No writes queued (or ordering was forced),
1056 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1061 * Writes are always appended. If no writes were previously
1062 * queued or an ordered tail insertion occured the transition
1063 * field will be NULL.
1065 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1066 if (bioq->transition == NULL)
1067 bioq->transition = bio;
1071 * All other request types are forced to be ordered.
1073 bioq_insert_tail(bioq, bio);
1079 * Move the read-write transition point to prevent reads from
1080 * completely starving our writes. This brings a number of writes into
1081 * the fold every N reads.
1083 * We bring a few linear writes into the fold on a minor interval
1084 * and we bring a non-linear burst of writes into the fold on a major
1085 * interval. Bursting only occurs if runningbufspace is really high
1086 * (typically from syncs, fsyncs, or HAMMER flushes).
1090 bioqwritereorder(struct bio_queue_head *bioq)
1098 if (bioq->reorder < bioq_reorder_burst_interval ||
1099 !buf_runningbufspace_severe()) {
1100 left = (size_t)bioq_reorder_minor_bytes;
1103 left = (size_t)bioq_reorder_burst_bytes;
1107 next_offset = bioq->transition->bio_offset;
1108 while ((bio = bioq->transition) != NULL &&
1109 (check_off == 0 || next_offset == bio->bio_offset)
1111 n = bio->bio_buf->b_bcount;
1112 next_offset = bio->bio_offset + n;
1113 bioq->transition = TAILQ_NEXT(bio, bio_act);
1121 * Disk error is the preface to plaintive error messages
1122 * about failing disk transfers. It prints messages of the form
1124 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1126 * if the offset of the error in the transfer and a disk label
1127 * are both available. blkdone should be -1 if the position of the error
1128 * is unknown; the disklabel pointer may be null from drivers that have not
1129 * been converted to use them. The message is printed with kprintf
1130 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1131 * The message should be completed (with at least a newline) with kprintf
1132 * or log(-1, ...), respectively. There is no trailing space.
1135 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
1137 struct buf *bp = bio->bio_buf;
1151 kprintf("%s: %s %sing ", dev->si_name, what, term);
1152 kprintf("offset %012llx for %d",
1153 (long long)bio->bio_offset,
1157 kprintf(" (%d bytes completed)", donecnt);
1161 * Locate a disk device
1164 disk_locate(const char *devname)
1166 return devfs_find_device_by_name(devname);
1170 disk_config(void *arg)
1172 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
1178 struct thread* td_core;
1180 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1182 objcache_malloc_alloc,
1183 objcache_malloc_free,
1184 &disk_msg_malloc_args);
1186 lwkt_token_init(&disklist_token);
1189 * Initialize the reply-only port which acts as a message drain
1191 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1193 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1194 0, 0, "disk_msg_core");
1196 tsleep(td_core, 0, "diskcore", 0);
1202 objcache_destroy(disk_msg_cache);
1206 * Clean out illegal characters in serial numbers.
1209 disk_cleanserial(char *serno)
1213 while ((c = *serno) != 0) {
1214 if (c >= 'a' && c <= 'z')
1216 else if (c >= 'A' && c <= 'Z')
1218 else if (c >= '0' && c <= '9')
1220 else if (c == '-' || c == '@' || c == '+' || c == '.')
1228 TUNABLE_INT("kern.disk_debug", &disk_debug_enable);
1229 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable,
1230 0, "Enable subr_disk debugging");
1232 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1233 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);